A fuel cell is an electrochemical device used to create electricity. Much like a battery, it converts chemical energy to electrical energy. But unlike a typical battery, which holds a limited fuel supply in a sealed container, a fuel cell uses an ongoing supply of fuel to create a continuous flow of electricity. Fuels like natural gas and methane gas are used to produce hydrogen and oxygen. The hydrogen and oxygen are then fed to two terminals in the fuel cell to cause a chemical reaction that produces electricity with heat and water as byproducts. Learn more about fuel cells.
An electrochemical cell which produces electricity by oxidation of fuel (hydrogen-oxygen or zinc-air); with minimal heat loss & high efficiencies.
A battery where reactants are supplied to the cell from an external source. An example is the H2 / O2 fuel cell, in which these gases react (in separate half-reactions at separate electrodes) to form protons and hydroxide, which are combined to form water.